<template>
  <div>
    <div class='goods'>
      <div class='menu-wrapper' ref='menuWrapper'>
        <ul>
          <li
            v-for='(item,index) in goods'
            class='menu-item'
            :class="{'current':currentIndex===index}"
            @click='selectMenu(index, $event)'
            :key='index'
          >
            <span class='text border-1px'>
              <span v-show='item.type>0' class='icon' :class='classMap[item.type]'></span>{{item.name}}
            </span>
          </li>
        </ul>
      </div>
      <div class='foods-wrapper' ref='foodsWrapper'>
        <ul>
          <li
            v-for='(item,index) in goods'
            class='food-list food-list-hook'
            :key='index'
          >
            <h1 class='title'>{{item.name}}</h1>
            <ul>
              <li
                @click='selectFood(food,$event)'
                v-for='(food,index) in item.foods'
                class='food-item border-1px'
                :key='index'
              >
                <div class='icon'>
                  <img width='57' height='57' :src="food.icon">
                </div>
                <div class='content'>
                  <h2 class='name'>{{food.name}}</h2>
                  <p class='desc'>{{food.description}}</p>
                  <div class='extra'>
                    <span class='count'>月售{{food.sellCount}}份</span>
                    <span>好评率{{food.rating}}%</span>
                  </div>
                  <div class='price'>
                    <span class='now'>￥{{food.price}}</span><span class='old' v-show='food.oldPrice'>￥{{food.oldPrice}}</span>
                  </div>
                  <div class='cartcontrol-wrapper'>
                    <cartcontrol :food='food'></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart
        :select-foods='selectFoods'
        :delivery-price='seller.deliveryPrice'
        :min-price='seller.minPrice'
      >
      </shopcart>
    </div>
    <food :selected-food='selectedFood' ref='food'></food>
  </div>
</template>

<script>
import axios from 'axios'
import BScroll from 'better-scroll'
import shopcart from 'components/shopcart/shopcart'
import cartcontrol from 'components/cartcontrol/cartcontrol'
import food from 'components/food/food'
export default {
  name: 'goods',
  props: {
    seller: {
      type: Object
    }
  },
  data () {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  created () {
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'gurantee']
    axios.get('/api/goods')
      .then((response) => {
        this.goods = response.data.data
        this.$nextTick(() => {
          this._initScroll()
          this._calculateHeight()
        })
      })
      .catch((error) => {
        console.log(error)
      })
  },
  methods: {
    selectMenu (index, event) {
      // 清除原生点击事件
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      this.foodScroll.scrollToElement(foodList[index], 300)
    },
    _initScroll () {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })
      this.foodScroll = new BScroll(this.$refs.foodsWrapper, {
        probeType: 3,
        click: true
      })
      this.foodScroll.on('scroll', (pos) => {
        this.scrollY = Math.abs(Math.round(pos.y))
      })
    },
    _calculateHeight () {
      let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook')
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    },
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.showFlag = true
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food
  }
}
</script>

<style lang='stylus' scoped>
  @import '../../common/stylus/mixin'
  *
    touch-action: none
  .goods
    display: flex
    position: absolute
    top: 174px
    bottom: 46px
    width: 100%
    over-flow: hidden
    .menu-wrapper
      overflow: hidden
      flex: 0 0 80px
      background: #f3f5f7
      .menu-item
        display: table
        width: 56px
        height: 54px
        line-height: 14px
        padding: 0 12px
        &.current
          position: relative
          margin-top: -1px
          z-index: 10
          background: #fff
          font-weight: 700
          color: rgb(240,20,20)
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.gurantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px
          font-size: 12px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-weight: 200
    .foods-wrapper
      overflow: hidden
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        font-size: 12px
        color: rgb(147, 153, 159)
        line-height: 26px
        border-left: 2px solid #d9dde1
        background: #f3f5f7
      .food-item
        display: flex
        margin: 18px
        padding-bottom: 18px
        border-1px(rgba(7, 17, 27, 0.2))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            font-size: 14px
            color: rgb(7, 17, 27)
            height: 14px
            line-height: 14px
            margin: 2px 0 8px 0
          .desc, .extra
            font-size: 10px
            color: rgb(147,153,159)
            line-height: 12px
          .desc
            margin-bottom: 8px
          .extra
            & .count
              margin-right: 12px
          .cartcontrol-wrapper
             position: absolute
             right: 0
             bottom: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              font-size: 14px
              color: rgb(240,20,20)
              margin-right: 8px
            .old
              font-size: 10px
              color: rgb(147,153,159)
              text-decoration: line-through
</style>
